[alsa-devel] [PATCH] [v2] ASoC: claim the IRQ when the fsl_ssi device is probed, not opened

[Timur Tabi]

The PowerPC Freescale SSI driver is claiming the IRQ when the IRQ when
the device is opened, which means that the /proc/interrupts entry for
the SSI exists only during playback or capture.  This also meant that
the user won't know that the IRQ number is wrong until he tries to use
the device.  Instead, we should claim the IRQ when the device is probed.

Signed-off-by: Timur Tabi <timur at freescale.com>
---
 sound/soc/fsl/fsl_ssi.c |   61 ++++++++++++++++++++++++++++------------------
 1 files changed, 37 insertions(+), 24 deletions(-)

diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
index d48afea..06ac2b9 100644
--- a/sound/soc/fsl/fsl_ssi.c
+++ b/sound/soc/fsl/fsl_ssi.c
@@ -289,16 +289,6 @@ static int fsl_ssi_startup(struct snd_pcm_substream *substream,
 	 */
 	if (!ssi_private->playback && !ssi_private->capture) {
 		struct ccsr_ssi __iomem *ssi = ssi_private->ssi;
-		int ret;
-
-		/* The 'name' should not have any slashes in it. */
-		ret = request_irq(ssi_private->irq, fsl_ssi_isr, 0,
-				  ssi_private->name, ssi_private);
-		if (ret < 0) {
-			dev_err(substream->pcm->card->dev,
-				"could not claim irq %u\n", ssi_private->irq);
-			return ret;
-		}
 
 		/*
 		 * Section 16.5 of the MPC8610 reference manual says that the
@@ -522,15 +512,12 @@ static void fsl_ssi_shutdown(struct snd_pcm_substream *substream,
 	ssi_private->second_stream = NULL;
 
 	/*
-	 * If this is the last active substream, disable the SSI and release
-	 * the IRQ.
+	 * If this is the last active substream, disable the SSI.
 	 */
 	if (!ssi_private->playback && !ssi_private->capture) {
 		struct ccsr_ssi __iomem *ssi = ssi_private->ssi;
 
 		clrbits32(&ssi->scr, CCSR_SSI_SCR_SSIEN);
-
-		free_irq(ssi_private->irq, ssi_private);
 	}
 }
 
@@ -675,17 +662,30 @@ static int __devinit fsl_ssi_probe(struct platform_device *pdev)
 	ret = of_address_to_resource(np, 0, &res);
 	if (ret) {
 		dev_err(&pdev->dev, "could not determine device resources\n");
-		kfree(ssi_private);
-		return ret;
+		goto error_kmalloc;
 	}
 	ssi_private->ssi = of_iomap(np, 0);
 	if (!ssi_private->ssi) {
 		dev_err(&pdev->dev, "could not map device resources\n");
-		kfree(ssi_private);
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto error_kmalloc;
 	}
 	ssi_private->ssi_phys = res.start;
+
 	ssi_private->irq = irq_of_parse_and_map(np, 0);
+	if (ssi_private->irq == NO_IRQ) {
+		dev_err(&pdev->dev, "no irq for node %s\n", np->full_name);
+		ret = -ENXIO;
+		goto error_iomap;
+	}
+
+	/* The 'name' should not have any slashes in it. */
+	ret = request_irq(ssi_private->irq, fsl_ssi_isr, 0, ssi_private->name,
+			  ssi_private);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "could not claim irq %u\n", ssi_private->irq);
+		goto error_irqmap;
+	}
 
 	/* Are the RX and the TX clocks locked? */
 	if (of_find_property(np, "fsl,ssi-asynchronous", NULL))
@@ -711,7 +711,7 @@ static int __devinit fsl_ssi_probe(struct platform_device *pdev)
 	if (ret) {
 		dev_err(&pdev->dev, "could not create sysfs %s file\n",
 			ssi_private->dev_attr.attr.name);
-		goto error;
+		goto error_irq;
 	}
 
 	/* Register with ASoC */
@@ -720,7 +720,7 @@ static int __devinit fsl_ssi_probe(struct platform_device *pdev)
 	ret = snd_soc_register_dai(&pdev->dev, &ssi_private->cpu_dai_drv);
 	if (ret) {
 		dev_err(&pdev->dev, "failed to register DAI: %d\n", ret);
-		goto error;
+		goto error_dev;
 	}
 
 	/* Trigger the machine driver's probe function.  The platform driver
@@ -741,18 +741,28 @@ static int __devinit fsl_ssi_probe(struct platform_device *pdev)
 	if (IS_ERR(ssi_private->pdev)) {
 		ret = PTR_ERR(ssi_private->pdev);
 		dev_err(&pdev->dev, "failed to register platform: %d\n", ret);
-		goto error;
+		goto error_dai;
 	}
 
 	return 0;
 
-error:
+error_dai:
 	snd_soc_unregister_dai(&pdev->dev);
+
+error_dev:
 	dev_set_drvdata(&pdev->dev, NULL);
-	if (dev_attr)
-		device_remove_file(&pdev->dev, dev_attr);
+	device_remove_file(&pdev->dev, dev_attr);
+
+error_irq:
+	free_irq(ssi_private->irq, ssi_private);
+
+error_irqmap:
 	irq_dispose_mapping(ssi_private->irq);
+
+error_iomap:
 	iounmap(ssi_private->ssi);
+
+error_kmalloc:
 	kfree(ssi_private);
 
 	return ret;
@@ -766,6 +776,9 @@ static int fsl_ssi_remove(struct platform_device *pdev)
 	snd_soc_unregister_dai(&pdev->dev);
 	device_remove_file(&pdev->dev, &ssi_private->dev_attr);
 
+	free_irq(ssi_private->irq, ssi_private);
+	irq_dispose_mapping(ssi_private->irq);
+
 	kfree(ssi_private);
 	dev_set_drvdata(&pdev->dev, NULL);
 
-- 
1.7.4.4